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Chevy's 6.6-liter Duramax is pretty much all new

To say there's a heated battle in heavy-duty pickups is an understatement, with Chevrolet, Ford, and Ram constantly trading blows of increased torque, horsepower, and towing capacity. The latest salvo is the revised, more powerful turbo diesel 6.6-liter Duramax V8 in the 2017 Chevy Silverado. It has 910 pound-feet of torque, an increase of 145, putting it nearly level with the Ford Super Duty. Here's a closer look at where those gains come from. How exactly did Chevrolet add all that torque plus 48 horsepower? The automaker essentially took a fine-tooth comb to the entire engine. Chevy says it changed 90 percent of the V8, and the cumulative effect of those small changes adds up to big increases. As you might guess, the turbocharger is updated. The larger unit features electric actuation of the variable nozzle turbine (VNT), and what Chevy calls a double axle cartridge mechanism that separates the VNT moving parts from the housing. That helps with heat performance as well, with a claim that the exhaust side of the turbo can run continuously up to 1,436 degrees Fahrenheit. Helping that cause are six exhaust gaskets made of Inconel - an nickel alloy that contains chromium and iron – and upgraded stainless steel for the exhaust manifold. Despite having the same cast iron cylinder block, albeit with some minor enhancements, the engine has new cylinder heads, pistons, piston pins, connecting rods, and crankshaft, which have all been upgraded to handle 20 percent higher cylinder pressures. Alongside the increase in pressure, Chevrolet also increased the cylinder head's structure with a honeycomb design. The pattern features high-strength aluminum with dual layer water jackets that not only improve strength, but also optimize water flow for better cooling. For 2017, the cylinder head also benefits from integrated plenum that aids the engine in getting more air under heavy loads. The cylinder head isn't the only component to get a minor update, as the pistons have a larger diameter pin for improved oil flow. The same detailed improvements has been bestowed to the humble connecting rods (second in our hearts only to the inanimate carbon rod). The new design has the bolts oriented roughly 45-degrees to the rod instead of parallel. The angle split design, as it's called allows for easier passage through the cylinder.

Autoblog Minute: Finalists announced for 2016 Tech of the Year award

Here are the finalists for Autoblog's 2016 Technology of the Year award. Autoblog's Chris McGraw reports on this edition of Autoblog Minute, with commentary from Autoblog executive producer Adam Morath, AutoblogGreen editor-in-chief Sebastian Blanco, and Autoblog senior editor Alex Kierstein. Show full video transcript text [00:00:00] It's Fall here in Detroit and for us that means it's time for football, autumn beers, and the fourth annual Autoblog Tech of the Year awards. I'm Chris McGraw and this is your Autoblog Minute. Tech of the Year is one of our favorite things here at Autoblog. It's a time when we get celebrate all the best tech from the industry we love most. [00:00:30] - [00:01:00] [Commentary form Adam Morath, Sebastian Blanco, Alex Kierstein] Past winners include, Tesla's Supercharger network, FCA's Uconnect system and the BMW i8. In 2016 we're doing something a little different for Tech of the Year. We've separated our award into two categories. One award for best tech car, and a second award for best technology of the year. The nominees for best car in 2016 are: [00:01:30] the Tesla Model S, the Chevrolet Volt, and the BMW 7 series. The nominees for best tech in 2016 are: Apple CarPlay, Android Auto, Volkswagen's MiB II with AppConnect, Ford Sync 3, Audi's Virtual Cockpit, the Smart Cross Connect App, and Volvo Sensus. [00:02:00] We're going to announce Autoblog's Tech of the Year winners in January at the 2016 North American International Auto Show, in Detroit. For Autoblog, I'm Chris McGraw. Autoblog Minute is a short-form video news series reporting on all things automotive. Each segment offers a quick and clear picture of what's happening in the automotive industry from the perspective of Autoblog's expert editorial staff, auto executives, and industry professionals. Green BMW Chevrolet Ford Hummer smart Tesla Volkswagen Volvo Technology Infotainment Autoblog Minute Videos Original Video

GM recalling 250,000 SUVs over door electronics

After a door-fire investigation that dates back to February, the National Highway Traffic Safety Administration has officially announced a recall today that affects around 250,000 General Motors SUVs for a faulty driver's door module. The recall applies to the Buick Rainier, Chevrolet Trailblazer, GMC Envoy, Isuzu Ascender and Saab 9-7X from the 2006 and 2007 model years, as well as the 2006 Chevrolet Trailblazer EXT and GMC Envoy XL for vehicles sold and/or registered in the Snow Belt.
Road salt use in these midwestern and northern states can lead to corrosion of the driver's door module on these GMT360 and GMT370 vehicles, which allows water to come in contact with the circuit board. If shorted out, the vehicle's power door locks and power windows will not work, and could possibly lead to overheating and, in some circumstances, a fire. No official word on how many total vehicles caught on fire, but back in June, 28 fires had been reported to the government agency. A fix for the problem is still being worked out, but all affected vehicle owners will be notified by GM.
Scroll down for the official NHTSA statement.